6.9

CVE-2026-41181: traefik

CVSS: 6.9v4.0MediumAnalyzed
AliasesGHSA-p6hg-qh38-555rGO-2026-5532openSUSE-SU-2026:10713-1
Published 15-05-2026Last modified 16-05-2026
Open JSON

Vulnerability summary

CVE-2026-41181 is a medium (CVSS 6.9) vulnerability in traefik. EPSS estimates a 0.50% chance of exploitation in the next 30 days, higher than 41.8% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
38/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.9/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.50%
0%100%
Low · +0.06 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
OPENSUSE-SU-2026:21761-1SUSE-SU-2026:23625-1

Timeline

  1. 15-05-2026
    PublishedVulnerability first disclosed.
  2. 16-05-2026
    Last modifiedVulnerability information updated.

Description

Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.44, 3.6.15, and 3.7.0-rc.3, there is an information disclosure vulnerability in Traefik's errors (custom error pages) middleware. When the backend returns a response matching the configured status range, the middleware forwards the original request's complete header set, including Authorization, Cookie, and other authentication material, to the separate error page service rather than only the minimal context needed to render the error page. This behavior is undocumented: the documentation states only that Host is forwarded by default, so operators are not warned that sensitive credentials are shared across service boundaries. Deployments using the errors middleware with a distinct error page service may inadvertently expose end-user credentials to infrastructure that was not intended to receive them. This vulnerability is fixed in 2.11.44, 3.6.15, and 3.7.0-rc.3.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.50%

Chance of exploitation in the next 30 days

Percentile

42%

Versus all other CVEs

30-day change

+0.06 pp

From 0.45% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.50%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Traefik

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Chainguard2 products
  • traefik-3.5All versions (No fix recorded)
  • traefik-fips-3.5All versions (No fix recorded)
Github.com/traefik/traefik2 products
  • v2< 2.11.44
  • v3< 3.6.15 | ≥ 3.7.0-rc.0, < 3.7.0-rc.3 | ≥ 3.7.0-rc.1, < 3.7.0-rc.3
Opensuse2 products
  • traefik2&distro=openSUSE Tumbleweed< 2.11.45-1.1
  • traefik&distro=openSUSE Tumbleweed< 3.6.16-1.1
Github.com/traefik1 product
  • traefikAll versions (No fix recorded)
Traefik1 product
  • traefik≥ 3.7.0-rc.0, < 3.7.0-rc.3 | ≥ 3.0.0-beta1, < 3.6.14 | < 2.11.43 | < 2.11.44 | ≥ 3.0.0, < 3.6.15 | 3.7.0:ea1 | 3.7.0:ea2 | 3.7.0:ea3 | 3.7.0:rc1 | 3.7.0:rc2

5 vendors · 8 products

References

8 links